Pulley-block.



N0- 827,959. PATENTED AUG. 7, 1906.

' P. BURGE- PU'LLEY BLOCK.

APPLICATION FILED MAY 7,1906.

THE NORRIS PETERS co., wasnnmrau, 0. c4

FRED BURGE, OF NEW HAVEN, CONNECTICUT.

PULLEY-BLOCK.

Specification of Letters Patent.

Patented Aug. 7, 1906.

Application filed May '7, 1906. Serial No. 315,627.

To all whom it may concern:

Be it known that I, FRED BURGE, a citizen of the United States, residingat New Haven, in the county of New Haven and State of Connecticut, haveinvented a new and useful Improvement in Pulley-Blocks; and I do herebydeclare the following, when taken in connection with the accompanyingdrawings and the numerals of reference marked thereon, to be a full,clear, and exact description of the same, and which said drawingsconstitute part of this specification, and represent, in-

Figure 1, a perspective view of a pulleyblock constructed in accordancewith my invention; Fig. 2, a plan view of the inner face of one of thetwo parts of which the block is composed, showing the swivel-sheave andrope in place; Fig. 3, a plan view of the inner face of the otherportion of the block; Fig. 4, a transverse sectional view through theblock.

This invention relates to an improvement in pulley-blocks, andparticularly to the construction of large pulleys for use in derricks ordigging-machines where the block is liable to encounter sand and gravelor other gritty substance which is liable to enter the block and notonly impede the movement of the rope, but cut out the axle on which thesheave runs, the object of the invention being the construction of ablock substantially closed, with the exception of the openings for therope, and yet one which permits the parts to be readily separated whendesired; and the invention consists in the construction hereinafterdescribed, and particularly recited in the claims.

In carrying out my invention I construct the block in two similar pieces2 and 3. The part 2 is formed with sectional flanges 4, 5, and 6, whilethe part 3 is constructed with corresponding flanges 7, 8, and 9, theflanges 9 extending upward forming a neck 10, which incloses a swivel orother eye 11, by which the block is suspended in the usual way. Theflanges 4 and 5 interlock with the flanges 7 and 8, and the flanges 5and 8 are formed with passages 12 and 13, respectively, giving clearancefor a rope 14:, which passes over the sheave 15. This sheave is mountedfor rotation upon a bolt 15*, the head of which rests within the recess16, formed in the outer face of the part 2, while the nut 17 of the boltenters into a corresponding recess 18, formed in the outer faceiof thepart 3, and by which bolt the parts are firmly locked in position. Owingpassages in to the arrangement of the interlockingflanges additionalbolts to hold the parts in position are not necessary. While I haveshown only one sheave within the block, it is apparent without furtherillustration that two or more sheaves might be employed, as is common inpulley-blocks. block is so nearly closed that it can come in contactwith sand or gravel without danger of any of the material being carriedinto the block by the rope. Furthermore, as the block is so nearlyclosed the interior may be filled with lubricating material, so that theblock will run without friction for a long time, thus increasing thelife of the sheave or the bolt on which it turns. When it is necessaryto replace the rope or the sheave, it is only necessary to remove thesingle bolt 15 to permit the parts to be separated, thus allowing achange to be made in a very short space of time.

I claim 1. A pulley-block formed in two parts each part formed withflanges, the flanges of the two parts interlocking, two of the flangesformed with passages for a rope, a sheave mounted between said platesupon a bolt which bolt serves to unite the parts of the block,substantially as described.

2. A pulley-block formed in two parts each part formed with similarflanges adapted to interlock with each other, two of the flanges forminga neck, an eye within said neck, ropetwo of the flanges, a sheavemounted between the parts of the block, and means for holding the twoparts together, substantially as described.

3. A pulley-block formed in two parts each part formed with similarflanges adapted to interlock with each other, two of the flanges forminga neck, an eye within said neck, ropepassages in two of the flanges, abolt connecting the two parts, the outer faces of which are recessed toreceive the head and nut of said bolt, and a sheave mounted on said boltbetween the said parts, substantially as described.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

\ FRED BURGE.

Witnesses:

A. R. BEEBE, J. F. D. MOINTOSH.

By this construction the

